Focusing on the freight-train dominant electrical railway power system (ERPS) mixed with ac-dc and ac-dc-ac locomotives (its factorε[0.70,0.84]), this paper proposes a factor-oriented flow controller (RPFC) for quality improvement of ERPS. The comprehensive relationship primary factor, converter capacity, two-phase load currents is built in paper. Besides, as main contribution paper, optimal compensating strategy that suited random fluctuated loads analyzed designed based real traction...

The study aimed to investigate the dynamic characteristics of cervical spine and determine effect material properties spinal components on it. A finite element model head-cervical was developed based CT scan data, first six orders modes (e.g. flexion-extension, lateral bending, vertical, etc.) were verified by experimental simulation studies. sensitivity conducted varying elasticity modulus hard tissues (cortical bone, cancellous endplates, posterior elements) soft (intervertebral disc...

An adaptive damping control scheme based on the dual Youla parameterization is proposed in this paper for inter-area low frequency oscillations. First, a set of observer-based feedback controllers are pre-designed using <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">${\rm H}_{2} /{\rm H}_{\infty}$</tex> </formula> robust method nominal operating conditions. Second, power system and parameterized...

An adaptive damping control scheme based on the classification and regression tree (CART) using wide‐area signals is proposed. A family of robust multiple‐input multiple‐output controllers are designed offline used in real‐time after current operating point retrieved from phasor measurement unit (PMU) data with CART interpolation. When power system close to a previously set point, only corresponding controller active. not any combined formed. 16‐machine 68‐bus for simulation test. Thyristor...

Abstract To reuse the energy dissipated by vehicle suspension, a semi-active suspension with self-powered magneto-rheological damper is proposed. An electromechanical coupling model of established. The conversion efficiency defined and investigated changing electrical parameters. By considering unmodeled dynamics perturbation values, an adaptive optimal fault-tolerant control algorithm proposed to ensure vibration-isolation performance. robust index constructed using Lyapunov equation...

For isolating multi-dimensional vibrations experienced by precise facilities carried on a vehicle, novel isolator is proposed based 2-RPC/2-SPC parallel mechanism with magneto-rheological dampers. Kinematics and dynamics of the are analyzed geometrics Lagrange method. Grey relation analysis approach conducted to determine contributions geometric parameters natural frequency conveniently. Through analysis, first order affected length fixed platform most significantly. Due manufacturing...

In order to reuse the energy dissipated by magneto-rheological (MR) damper, a self-powered MR damper is designed and analyzed theoretically. The main thrust of this work establishing mechanical-electromagnetic coupling model quarter vehicle suspension based on whilst conversion efficiency with electromagnetic parameters changing investigated. magnetic circuit formulated firstly. influence current in systemically frequency domain. A multi-objective optimization method performed determine...

—Common wide-area signal selection methods hardly guarantee the control effect of a closed-loop system. In addition, signals selected by these could not adapt to different types controllers and have poor robustness against system uncertainty. Addressing problems, an optimal method based on contribution factor is proposed in this article improve damping feedback signals. First, eigenvalues closed loops quantified interval extension theory perturbation theory. On basis, concepts sum are...

In view of the reduced low-frequency oscillation damping effect caused by inaccurate modeling power system due to various uncertainties, a Youla parameterization robust control strategy considering uncertainties is proposed in this article. First, measurement error and parameter estimation are described perturbation matrix, convex polytopic model utilized describe variation operating point. Then, solving H2/H∞ inequalities, matrix gained. Finally, output actual nominal introduced feedback...

Different driving postures may alter the impact of vibrations on lumbar spine. This study explores influence posture spine by analyzing risk intervertebral disc vibration injury. Initially, Python language was utilized to develop code obtain 48 different postural three-dimensional finite element models human-chair system. Subsequently, these underwent harmonic response analyses at frequencies 5, 7, and 9 Hz, with maximum Von Mises stress L4–L5 used calculate factor. Finally, a neural network...

For reducing multidimensional vibrations endured by supine patients on ambulances, a new ambulance stretcher composed of parallel mechanism and self-powered magneto-rheological damper is introduced. The main thrust this work to investigate the vibration isolation capability energy conversion efficiency proposed with changes in electrical parameters. First, kinematic dynamic equations are deduced geometry Lagrange approach, respectively. Subsequently, circuit model created. frequency response...

Abstract For isolating multi-dimensional vibration experienced by vehicle-mounted precise facility, a isolator based on parallel mechanism with joint clearance is designed and analyzed. The main thrust of the work establishing kinematic dynamic equations isolator, exploring isolation capability clearance. Firstly, type synthesis three translations one rotation performed. are deduced. Subsequently, performance simulated different values under harmonic stochastic excitations in time frequency...